Pick the profile by the edge it finishes, size it 1.5 to 2 mm above the tile thickness so it clears the mortar bed, match the material to the room, and set it in the same thinset as the tile. Grout the joint between tile and profile, and run flexible sealant, not grout, at inside corners and other change-of-plane joints.
Which profile shape fits each edge?
Metal profiles anchor into the mortar bond coat with a perforated leg, so they go in while the tile is set. The familiar Schluter names below are the reference most shops stock; generic equivalents use the same shapes.
| Edge | Profile shape | What it gives you |
|---|---|---|
| Outside corner, straight look | L-angle (JOLLY / SCHIENE) | Slim sloped edge; JOLLY suits walls, SCHIENE also comes in stainless for floors |
| Outside corner, soft look | Quarter-round (RONDEC) | Symmetrically rounded corner with a 6 mm radius; forgiving on hips and columns |
| Outside corner, square look | Square reveal (QUADEC) | Geometric right angle; stainless versions work as stair nosings and floor transitions |
| Flat exposed edge (wainscot top, backsplash end) | L-angle or square reveal | Finishes the cut edge where the field stops |
| Minimal visible trim | FINEC | Thinnest reveal of the standard profiles |
| Retrofit over existing tile | No-anchor retrofit profile (QUADEC-K type) | Open cavity fills with mortar or adhesive; suits wainscots over old tile up to 12.5 mm thick |
| Traditional ceramic look | Bullnose field or trim tile | Rounded fired edge that blends with the field tile; no metal visible |
Inside corners take no profile. Caulk finishes those, so leave them out of the trim order.
What size trim does your tile need?
Measure the tile thickness with calipers, not the box label. Add 1.5 to 2 mm (about 1/16 to 1/8 in) for the mortar bed, then pick the next profile depth at or above that number.
A 10 mm porcelain tile needs an 11.5, 12, or 12.5 mm profile. A trim sized exactly to the tile sits low once the mortar compresses, leaving the raw tile edge exposed. A trim two or more sizes too tall stands proud of the tile face and becomes a lip on floors.
Check the profile data sheet for the exact depth steps. Imperial lines step in 1/16 in increments, and the same rule applies: tile thickness plus mortar allowance, rounded up to the next stocked depth.
Which material suits the room?
| Material | Best for | Limitation |
|---|---|---|
| Anodized or color-coated aluminum | Most interior walls, backsplashes, showers | Softer than steel; can dent on exposed floor edges |
| Stainless steel (304, or 316 near salt) | Wet areas, commercial kitchens, high-traffic floors, exteriors | Costs more; cutting needs the right blade |
| PVC | Budget interiors and DIY wall jobs | Less mechanical strength; avoid floor edges that take impact |
| Solid brass, chrome-plated | Decorative accents, traditional bathrooms | Premium price; finish choice locks the palette |
| Ceramic or porcelain bullnose | Rooms where no metal should show | Limited to the tile line's own trim pieces and colors |
Keep one profile family, material, and finish across every visible run in the room. Mixed batches can show shade differences after anodizing or coating.
Which thinset holds the trim?
The profile's anchoring leg beds in the same mortar bond coat as the tile, so the thinset choice follows the tile and substrate, not the trim. For most tile over cement board, plywood, or concrete, use a polymer-modified thinset labeled ANSI A118.4 or A118.15. The polymers add bond strength and flexibility that plain cement mortar lacks.
One exception changes the choice. Over an impervious waterproofing or uncoupling membrane, the membrane maker usually calls for unmodified thinset (ANSI A118.1, also sold as dry-set mortar). Modified mortar cures partly by air-drying, and the membrane blocks that drying between tile and membrane. Follow the membrane data sheet; it governs.
Spread enough mortar to fully embed the perforated leg with no voids. A hollow leg is the failure point, not the visible edge.
What fills the joints?
Grout the narrow joint between the tile and the profile. Profiles with an integrated joint spacer set that gap for you; without one, hold a consistent joint with spacers.
At inside corners, wall-to-floor changes of plane, and movement joints, use a flexible sealant such as 100 percent silicone, urethane, or polysulfide. Grout does not absorb movement, and these joints crack it. This matches the TCNA Handbook detail EJ171 for movement accommodation.
Order the matching inside and outside corner pieces and connectors for the profile you chose. They exist for the standard profiles but vary by line, so confirm them on the data sheet before you buy.
Sources and scope
- Schluter Systems, Wall and Countertop Profiles product overview: JOLLY, RONDEC, QUADEC, SCHIENE, QUADEC-K shapes, materials, anchoring leg in the mortar bond coat, corner and connector availability. Accessed 2026-10-23.
- Schluter, modified vs unmodified thin-set mortar FAQ: unmodified = ANSI A118.1 dry-set mortar; modified = ANSI A118.4, A118.11, A118.15. Accessed 2026-10-23.
- Schluter, wall areas: JOLLY slimmer look, QUADEC geometric corner, RONDEC rounded corner, FINEC most discreet. Accessed 2026-10-23.
- niuyuantrims, What Is Tile Trim?: size rule of tile thickness plus 1.5 to 2 mm; 10 mm tile needs 11.5 or 12 mm trim. Accessed 2026-10-23.
- Engineer Fix, How to Use Tile Trim for a Professional Finish: 1 to 2.5 mm allowance for the mortar bed; 10 mm tile with 12.5 mm trim; material by environment; ceramic bullnose alternative. Accessed 2026-10-23.
- niuyuanmetal, Tile Trim Profiles: 6 Types Compared: position-first selection; aluminum 6063/6463 standard, 304/316 stainless wet and commercial, brass decorative, PVC budget. Accessed 2026-10-23.
- Ceramic Tile Education Foundation, movement and expansion joints: movement joints required per ANSI A108.02; resilient fillers (silicone, urethane, polysulfide) per TCNA Handbook EJ171. Accessed 2026-10-23.
- Remodel or Move, modified or unmodified thinset: Schluter recommends thinset labeled ANSI 118.4 (S1 or M1) for most tile and stone applications. Accessed 2026-10-23.
Scope: profile names are the widely stocked Schluter reference; generic profiles use the same shapes and the same sizing rule. The mortar call follows the tile and substrate on the product data sheet; the membrane maker's sheet governs over membranes. The sizing and overage numbers are planning guidance from trade sources, not a code requirement.
Review responsibility: Saleem Sial owns the published calculation, source, and editorial checks. Waseem Sial, External Reviewer and Engineer, remains listed for ongoing external review; no completed external-review date is claimed.
Next, measure the edges with the tile trim measuring guide, check mortar coverage with the tile adhesive coverage guide, or pick grout with the sanded vs unsanded grout guide.
